fix cfgvalidator_driver error missing id_ attrib
fix cfgvalidator_driver error missing id_ attrib

oslo.config 4.4.0 adds some default options to each config object.
These default options caused errors because they are not expected
by the code in cfgvalidator_driver.
This patch fixes the error by having cfgvalidator_driver code
filter out unexpected options based on required attributes.

Change-Id: I6b8839dcb0e53839206ec2bb42c8945dc867249a
Release-team: bugfix

openstack/congress,openstack/congress